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Effect of temperature and hybridisation on the low velocity impact behavior of hemp-basalt/epoxy composites

机译：温度和杂化对大麻-玄武岩/环氧树脂复合材料低速冲击行为的影响

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摘要

This work focuses on the experimental investigation of the residual flexural strength of hemp/epoxy, basalt/epoxy and hybrid (hemp-basalt)/epoxy composite laminates subjected to low velocity impact damage at different temperatures. These specimens were subjected to a low velocity impact of 1.5 m/s with an incident impact energy of 2.17 J using an instrumented drop weight impact tester at three different temperatures of 30 degrees C, 50 degrees C and 65 degrees C. The residual flexural strength of the post impacted specimens were measured by the conduction of three point bending test in a 100 kN universal testing machine with acoustic emission monitoring. The effects of temperature and basalt fiber hybridisation on the damage initiation, propagation and onset of failure were investigated using the magnitude of AE cumulative counts at different stages of loading. The results show a reduction in impact strength and residual flexural strength after impact at elevated temperatures. Lower impact resistance shown in the impact test results for all three types of composites at elevated temperatures indicate the effect of temperature which leads to inferior impact properties. It was evidenced from the impact and dynamic mechanical analysis (DMA) carried out on the composites that hybrid composites have better residual flexural strength and impact properties compared to non-hybrid composites. (C) 2015 Elsevier Ltd. All rights reserved.
机译：这项工作的重点是对大麻/环氧树脂，玄武岩/环氧树脂和混合（麻木-玄武岩）/环氧树脂复合材料层压板在不同温度下受到低速冲击破坏的残余挠曲强度进行实验研究。使用仪器的落锤冲击测试仪在30°C，50°C和65°C的三种不同温度下，对这些样品进行1.5 m / s的低速冲击，入射冲击能量为2.17J。残余挠曲强度通过在具有声发射监测功能的100 kN通用测试机中进行三点弯曲测试，测量了后冲击试样的数量。温度和玄武岩纤维杂交对损伤开始，蔓延和破坏开始的影响，是通过在不同载荷阶段的AE累积计数的大小来研究的。结果表明在高温下冲击后冲击强度和残余挠曲强度降低。在升高的温度下，所有三种类型的复合材料在冲击试验结果中均显示出较低的抗冲击性，表明温度的影响导致了较低的冲击性能。从对复合材料进行的冲击和动态力学分析（DMA）可以看出，与非混合材料相比，杂化复合材料具有更好的残余弯曲强度和冲击性能。 （C）2015 Elsevier Ltd.保留所有权利。

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